Frequency Distributions
an organized tabulation showing the number of individuals located in each category on the scale of measurement.
frequency distribution
the score or category that has the greatest frequency
mode
provides a quantitative measure of the differences between scores in a distribution and describes the degree to which the scores are spread out or clustered together
variability
a single measurement or observation
raw score
a fraction or a proportion of all the possible outcomes
probability
one side of the distribution is a mirror image of the other
symmetrical distribution
is a statistical measure to determine a single score that defines the center of a distribution
central tendancy
the average squared distance from the mean
variance
scores that have been transformed to create predetermined values
each individual in the population has an equal chance of being selected
random sampling
the scores tend to pile up toward one end of the scale and taper off gradually at the other end
skewed distribution
the midpoint of the list
median
average distance from the mean
standard deviation
z= x-(babymu)/ standard deviation
population z score formula
an equal chance of being selected and that the probability of being selected stays constant from one selection to the nex
independent random sampling
The section where the scores taper off toward one end of a distribution
tail(s) of a distribution
population mean
little mu
n-1
degrees of freedom
z=X-M/s
population z score
a sample created under the condition that the probability of being selected stays constant from one selection to the next
random sample
scores such as IQ scores
standardized
sample mean
M
the average value of the statistic is equal to the population paramete
unbiased statistic
formula to translate z score back into number for sample
X=M+zs
measure the relative standing of a score within a distribution
percentile